1-D Model for Propagation and Absorption of H.F. Waves Near Ion Cyclotron Resonances in Large Tokamak Plasmas

摘要

The behaviour of h.f. waves near ion cyclotron and ion ion hybrid resonances in a tokamak is investigated by means of an one-dimensional finite element code. Our model takes into account: - strength and orientation of the poloidal component of the static magnetic field, - finite larmor radius corrections to the dielectric tensor, - ion cyclotron damping at the fundamental and first harmonic resonance, - electron Landau damping to lowest order msub(e)/msub(i). We assume that an incoming fast wave approaches the singular layer from the low or high field side making an arbitrary angle relative to the local magnetic flux surface and to the resonance layer. These initial conditions might be provided by ray tracing from the antenna. Then we calculate the electromagnetic wavefield and the power fluxes of the transmitted or reflected fast and slow waves as well as the power absorbed by ions and electrons. (ERA citation 11:058207)